JP2017017893A - Controller of power storage facility, control method and program for power storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control multiple types of physical quantity in a power system more accurately.SOLUTION: A controller for controlling a power storage facility linked with a power system includes a power calculation unit calculating an effective power target value for controlling the first physical quantity of a power system to a first target value, and calculating a reactive power target value for controlling the second physical quantity of the power system to a second target value, a power correction unit for calculating an effective power correction value for cancelling variation of the first physical quantity caused by reactive power, and calculating a reactive power correction value for cancelling variation of the second physical quantity caused by effective power, and a command value output unit for outputting a command value of effective power calculated by correcting the effective power target value by the effective power correction value, and a command value of reactive power calculated by correcting the reactive power target value by the reactive power correction value, to the power storage facility.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a control device for a power storage device, a control method for the control device for the power storage device, and a program.

  In recent years, the introduction of power generation facilities using renewable energy such as wind power and sunlight has been promoted in various places. However, since power generation facilities using such renewable energy fluctuate due to the influence of weather conditions, various physical quantities in the power system such as frequency, power flow, and voltage are fluctuated to improve power quality. May decrease.

  Therefore, efforts are being made to stabilize the power system by controlling active power and reactive power in the power system by installing a power storage device such as a storage battery or a flywheel (see, for example, Patent Document 1).

JP 2012-19667 A

  However, the frequency and power flow in the power system can be controlled by controlling the active power, but fluctuate under the influence of the reactive power, while the voltage in the power system is controlled by controlling the reactive power. However, it fluctuates under the influence of active power.

  Therefore, it is not easy to accurately control a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system using the power storage device.

  The present invention has been made in view of such problems, and a control device for a power storage device and a power storage device capable of more accurately controlling a plurality of types of physical quantities such as frequency, power flow, and voltage of a power system. It is an object to provide a control method and program for the control device.

  One of means for solving the above problem is a control device for controlling a power storage device linked to the power system, wherein the power storage is performed so as to control the first physical quantity in the power system to a first target value. A power calculation unit that calculates a target value of active power to be output by the device and a target value of reactive power to be output by the power storage device to control the second physical quantity in the power system to the second target value; A correction value of the active power that cancels the fluctuation of the first physical quantity caused by the reactive power output by the power storage device, and the second generated by the power storage device outputting the active power. A power correction unit that calculates a correction value of the reactive power so as to cancel the fluctuation of the physical quantity; a command value of the active power calculated by correcting the target value of the active power with the correction value of the active power; The target of the serial reactive power and an instruction value output unit that outputs to the power storage device, and the command value of the reactive power calculated by correcting by the correction value of the reactive power.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description in the column of the embodiment for carrying out the invention and the description of the drawings.

  According to the present invention, it is possible to more accurately control a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system.

It is a figure which shows the structure of the electric power grid | system which concerns on embodiment. It is a figure which shows the structure of the electric power storage apparatus which concerns on embodiment. It is a figure which shows the structure of the control apparatus which concerns on embodiment. It is a figure which shows the structure of the control apparatus which concerns on embodiment. It is a figure which shows the structure of the memory | storage device which concerns on embodiment. It is a figure which shows the block diagram which concerns on embodiment. It is a flowchart which shows the flow of a process of the control apparatus which concerns on embodiment. It is a flowchart which shows the flow of a process of the control apparatus which concerns on embodiment. It is a figure which shows the block diagram which concerns on embodiment.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

== Power system ==
As shown in FIG. 1 as an example, the power system 400 according to the present embodiment includes a power generation facility 410 (G), a power transmission / distribution line 430 (Z1, Z2), a bus 420 (n1, n2, n3), a load 440, and A measuring instrument 450 is included.

  The power generation facility 410 is a power source that generates power energy, and includes a hydroelectric power generation facility, a nuclear power generation facility, a thermal power generation facility, a solar power generation facility, a wind power generation facility, and the like.

  The bus 420 is provided at a power plant or a substation.

  The load 440 is an electrical device in a factory or home that operates using the power supplied from the power generation facility 410.

  The measuring instrument 450 is a device that is installed in the power system 400 and measures physical quantities (frequency, voltage, power flow, etc.) that vary depending on the state of power in the power system 400. In the present embodiment, the measuring instrument 450 measures the frequency (first physical quantity) and voltage (second physical quantity) on the bus (n3) 420 every predetermined time (for example, every 15 minutes or every hour), and a control device described later 100.

  The measuring instrument 450 is not limited to measuring the frequency and voltage, but may measure various other physical quantities such as the power consumption of the load 440, the current flowing through the transmission and distribution line 430, and the power factor.

  Although not shown in FIG. 1, the electric power system 400 is configured to include various facilities such as phase adjusting equipment for controlling the phase of electric power, a transformer, and a switch.

== Power storage device ==
The power storage device 200 is a device that is connected to the power system 400 and can accumulate and extract power energy obtained from the power system 400. The power storage device 200 can be configured by various types of devices such as a storage battery, a flywheel, and a capacitor. The configuration of the power storage device 200 is shown in FIG.

  The power storage device 200 includes a bidirectional converter 210 and an energy storage unit 220.

  The energy storage unit 220 is a device that stores electrical energy acquired from the power system 400 in a state where it can be restored to the original electrical energy. The energy storage unit 220 can be configured by a battery using various chemical reactions such as a sodium sulfur battery, a lead battery, or a redox flow battery. Alternatively, the energy storage unit 220 can be configured by an electric double layer capacitor. Alternatively, the energy storage unit 220 may be a flywheel that can store electric power energy in the form of rotational energy.

  Bidirectional converter 210 performs energy conversion and exchange between power system 400 and energy storage unit 220. Bidirectional converter 210 outputs specified amounts of active power and reactive power in accordance with commands (active power command value, reactive power command value) from control device 100 described later.

  When the command value of active power and the command value of reactive power are positive values, bidirectional converter 210 according to the present embodiment supplies active power and reactive power from power storage device 200 to power system 400. When the active power command value and the reactive power command value are negative values, the power storage device 200 operates to take in the active power and the reactive power.

  Transformer 300 converts the voltage between bus 420 (n3) and power storage device 200.

== Control device ==
The control device 100 according to the present embodiment sets a first physical quantity (for example, a frequency) and a second physical quantity (for example, a voltage), which vary according to the state of power in the power system 400, to predetermined target values (first target). Value, second target value) to control the active power and reactive power output from the power storage device 200.

  3 and 4 show the overall configuration of the control device 100 according to the present embodiment. FIG. 3 is a diagram for explaining a functional configuration of the control device 100, and FIG. 4 is a diagram for explaining a hardware configuration of the control device 100.

<Hardware configuration>
As shown in FIG. 4, the control device 100 according to the present embodiment includes a CPU (Central Processing Unit) 110, a memory 120, a communication device 130, a storage device 140, an input device 150, an output device 160, and a recording medium reading device 170. It is the computer which has and is comprised.

  The CPU 110 is responsible for overall control of the control device 100, and reads out and executes the control program 600 composed of codes for performing various operations according to the present embodiment stored in the storage device 140 to the memory 120. Thus, various functions as the control device 100 are realized.

  For example, although details will be described later, the control program 600 is executed by the CPU 110 and cooperates with hardware devices such as the memory 120, the communication device 130, and the storage device 140, so that the measurement value acquisition unit 101 ( First measurement value acquisition unit 101a, second measurement value acquisition unit 101b), calculation unit 102 (active power calculation unit 102a, reactive power calculation unit 102b, active power correction unit 102c, reactive power correction unit 102d, first command value calculation Unit 102e, second command value calculation unit 102f, first difference calculation unit 107a, second difference calculation unit 107b), storage unit 103, function update unit 104 (first function update unit 104a, second function update unit 104b, second 3 function updating unit 104c, fourth function updating unit 104d), predicted value calculating unit 105 (first predicted value calculating unit 105a, second predicted value calculating unit 105b), Such as the value output unit 106 are realized.

  The memory 120 can be configured by a semiconductor memory device, for example.

  The communication device 130 is a network interface such as a network card. The communication device 130 receives data from another computer via a network such as the Internet or a LAN (Local Area Network), and stores the received data in the storage device 140 or the memory 120. Further, the communication device 130 transmits data stored in the storage device 140 or the memory 120 to another computer via the network.

  The input device 150 is a device such as an operation switch, a keyboard, a mouse, or a microphone, and is a device for accepting input of information by an operator of the control device 100. The output device 160 is a device such as an LCD (Liquid Crystal Display), a display lamp, various display meters, a printer, and a speaker, and is a device for outputting information.

  The storage device 140 can be constituted by, for example, a hard disk device or a semiconductor storage device. The storage device 140 is a device that provides a storage area for storing various programs, data, tables, and the like. FIG. 5 shows a state in which a control program 600, transfer functions 700 to 709, a first target value 710, a second target value 720, and system information 730 are stored in the storage device 140.

  The control program 600, transfer functions 700 to 709, the first target value 710, the second target value 720, and the system information 730 are recorded on a recording medium (various optical disks, magnetic disks, semiconductor memories) using the recording medium reader 170. Etc.) It can be stored in the control device 100 by reading it from the storage device 140 from 800, or it can be obtained from the input device 150 or from another computer that is communicably connected via the communication device 130. By doing so, it can be stored in the control device 100.

  The transfer functions 700 to 709 are functions used when calculating the active power command value and the reactive power command value output from the control device 100 to the power storage device 200. Note that the transfer functions 700 to 709 according to the present embodiment are data conversion elements that can calculate the value of target data from given data values, and are not limited to mathematical expressions defined in the complex number domain. It may be a mathematical formula defined in the real time domain, or may include a data table or a list.

  The first target value 710 is a target value for the frequency (first physical quantity) in the power system 400.

  The second target value 720 is a target value of the voltage (second physical quantity) in the power system 400.

  The system information 730 is data relating to the power system 400 including, for example, the length and line impedance of the transmission / distribution line 430 in the power system 400, the position and active power and reactive power of the load 440, the position and output power of the power generation facility 410, and the like. is there.

<Block diagram>
Next, referring to FIG. 6, a block diagram used by the control device 100 according to the present embodiment to obtain a command value for active power and a command value for reactive power output to the power storage device 200 will be described. .

  The block diagram illustrated in FIG. 6 represents a control model including the power system 400, the power storage device 200, and the control device 100. The control device 100 executes this control program 600 by using the transfer functions 700 to 709, the first target value 710, the second target value 720, the system information 730, and the like stored in the storage device 140. Various calculations according to the control model are performed, and command values for active power and reactive power output to the power storage device 200 are calculated.

  In FIG. 6, the command value of active power and the command value of reactive power output from the control device 100 to the power storage device 200 are indicated by Pr and Qr, respectively.

  The power storage device 200 outputs active power and reactive power indicated by Pb and Qb to the power system 400 in accordance with the active power command value Pr and reactive power command value Qr. As a result, the frequency (first physical quantity) of the power system 400 becomes F ′ and the voltage (second physical quantity) becomes V ′.

  The power storage device 200 according to the present embodiment outputs active power Pb equal to the active power command value Pr and outputs reactive power Qb equal to the reactive power command value Qr.

  The power system 400 includes a fifth transfer function 705 (G11), a sixth transfer function 706 (G12), a seventh transfer function 707 (G22), an eighth transfer function 708 (G21), a first predicted value calculation unit 105a, 2 is represented by the predicted value calculation unit 105b.

  The fifth transfer function 705 (G11) can calculate a calculated value of the frequency (first physical quantity) of the power system 400 expected when the power storage device 200 outputs the active power Pb corresponding to the command value Pr of the active power. Function.

  The sixth transfer function 706 (G12) is a fluctuation amount of the frequency (first physical quantity) of the power system 400 that is expected to be generated when the power storage device 200 outputs the reactive power Qb corresponding to the reactive power command value Qr. Is a function that can calculate

  The first predicted value calculation unit 105a corrects the calculated value of the frequency with the amount of fluctuation of the frequency (added in the present embodiment) to calculate a predicted value F ′ of the frequency of the power system 400.

  The seventh transfer function 707 (G22) can calculate a calculated value of the voltage (second physical quantity) of the power system 400 that is expected when the power storage device 200 outputs the reactive power Qb according to the reactive power command value Qr. Function.

  The eighth transfer function 708 (G21) is a fluctuation amount of the voltage (second physical quantity) of the power system 400 that is expected to be generated when the power storage device 200 outputs the active power Pb corresponding to the command value Pr of the active power. Is a function that can calculate

  The second predicted value calculation unit 105b corrects the calculated value of the voltage with the amount of fluctuation of the voltage (added in the present embodiment) to calculate a predicted value V ′ of the voltage of the power system 400.

  As described above, when the active power Pb is output from the power storage device 200, the power system 400 not only changes the frequency of the power system 400 but also the voltage, and the reactive power Qb is output from the power storage device 200. Then, not only the voltage of the electric power system 400 fluctuates but also the frequency fluctuates.

  That is, in the power system 400, when the active power Pb output from the power storage device 200 is controlled in order to control the frequency, the voltage of the power system 400 also varies due to the influence, and the output from the power storage device 200 tries to control the voltage. When the reactive power Qb to be controlled is controlled, the frequency of the power system 400 is also affected and fluctuates.

  In order to remove such interference, the control apparatus 100 according to the present embodiment uses the third transfer function 703 (C1) and the fourth transfer function 704 (C2) described below to output the power storage apparatus 200. The active power command value Pr and the reactive power command value Qr to be calculated are calculated. This makes it possible to more accurately control a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system 400.

  Specifically, first, the block diagram of the control device 100 includes a first difference calculation unit 107a, a second difference calculation unit 107b, a first transfer function 701 (K1), a second transfer function 702 (K2), The third transfer function 703 (C1), the fourth transfer function 704 (C2), the first command value calculation unit 102e, and the second command value calculation unit 102f.

  The first difference calculation unit 107 a calculates a difference ΔF between the frequency measurement value F in the power system 400 and the target frequency (first target value) 710.

  The second difference calculation unit 107b calculates a difference ΔV between the voltage measurement value V in the power system 400 and the target voltage (second target value) 720.

  The first transfer function 701 (K1) is a function that calculates an active power target value that is a target value of active power that the power storage device 200 should output from the frequency difference ΔF.

  The second transfer function 702 (K2) is a function that calculates a reactive power target value that is a target value of reactive power that the power storage device 200 should output from the voltage difference ΔV.

  The first transfer function 701 (K1) and the second transfer function 702 (K2) are designed using the system information 730 stored in the storage device 140, for example.

  The third transfer function 703 (C1) is a function for removing interference from the reactive power Qb when the frequency of the power system 400 is controlled by the active power Pb. Specifically, the third transfer function 703 (C1) uses the reactive power target value calculated by the second transfer function 702 (K2), and the active power target calculated by the first transfer function 701 (K1). An active power correction value that is a correction amount for the value is calculated.

  The fourth transfer function 704 (C2) is a function for removing interference from the active power Pb when the voltage of the power system 400 is controlled by the reactive power Qb. Specifically, the fourth transfer function 704 (C2) uses the active power target value calculated by the first transfer function 701 (K1) and uses the reactive power target calculated by the second transfer function 702 (K2). A reactive power correction value that is a correction amount for the value is calculated.

  The first command value calculation unit 102e corrects the active power target value with the active power correction value (added in the present embodiment), and calculates the command value Pr of the active power for the power storage device 200.

  The second command value calculation unit 102f calculates the reactive power command value Qr for the power storage device 200 by correcting (adding in this embodiment) the reactive power target value with the reactive power correction value.

  Then, the control device 100 calculates a command value Pr for the active power and a command value for the reactive power Qr to be output to the power storage device 200.

  As described above, the control device 100 according to the present embodiment calculates the command value Pr of the active power and the command value of the reactive power Qr using the first transfer function 701 to the fourth transfer function 704. Even when the characteristics of the direct storage device 200 and the power system 400 change, it is possible to respond quickly and flexibly by changing the first transfer function 701 to the fourth transfer function 704, and the power system 400 The control can be continued so as to maintain the target frequency and target voltage.

  Next, the third transfer function 703 (C1) and the fourth transfer function 704 (C2) for removing the interference will be specifically described.

  First, the following (Formula 1) to (Formula 6) hold from the block diagram shown in FIG.

Pr = (K1 × ΔF) + (C1 × K2 × ΔV) (Formula 1)
Qr = (C2 × K1 × ΔF) + (K2 × ΔV) (Formula 2)
F ′ = (G11 × Pb) + (G12 × Qb) (Formula 3)
V ′ = (G21 × Pb) + (G22 × Qb) (Formula 4)
Pb = Pr (Formula 5)
Qb = Qr (Formula 6)
When Pr, Pb, Qr, and Qb are deleted from (Expression 1) to (Expression 6), (Expression 7) to (Expression 8) are obtained.

F ′ = (G11 + G12 × C2) × (K1 × ΔF) + (G11 × C1 + G12) × (K2 × ΔV) (Expression 7)
V ′ = (G21 + G22 × C2) × (K1 × ΔF) + (G21 × C1 + G22) × (K2 × ΔV) (Equation 8)
In order to eliminate the interference, (Expression 9) to (Expression 10) must be satisfied. Then, by solving (Equation 9) to (Equation 10) for C1 and C2, C1 and C2 can be obtained as (Equation 11) to (Equation 12).

(G11 × C1 + G12) = 0 ... (Formula 9)
(G21 + G22 × C2) = 0 ... (Formula 10)
C1 = -G12 / G11 (Formula 11)
C2 = -G21 / G22 (Formula 12)
That is, the third transfer function 703 (C1) and the fourth transfer function 704 (C2) are obtained by obtaining the fifth transfer function 705 (G11) to the eighth transfer function 708 (G21) which are transfer functions of the power system 400. Can be confirmed.

  The fifth transfer function 705 (G11) to the eighth transfer function 708 (G21) can be obtained by using a known system identification technique as will be described later.

  The control device 100 according to the present embodiment incorporates the third transfer function 703 (C1) and the fourth transfer function 704 (C2) determined in this way into the control model, thereby enabling the power storage device 200 to output The power command value Pr and the reactive power command value Qr are calculated. For this reason, when the power storage device 200 outputs the active power Pb and the reactive power Qb, it is possible to remove interference generated in the frequency, power flow, and voltage of the power system 400, and the frequency, power flow, voltage, etc. of the power system 400 can be removed. This makes it possible to control a plurality of types of physical quantities more accurately.

<Control function of power storage device>
Next, the control function and operation of the power storage device 200 included in the control device 100 according to the present embodiment will be described with reference to FIG. 3 and FIGS.

  As shown in FIG. 3, the control device 100 includes a measurement value acquisition unit 101, a calculation unit 102, and a command value output unit 106.

  The calculation unit 102 includes a first difference calculation unit 107a, a second difference calculation unit 107b, an active power calculation unit 102a, a reactive power calculation unit 102b, an active power correction unit 102c, a reactive power correction unit 102d, and a first command value calculation. A unit 102e and a second command value calculation unit 102f are included.

  The active power calculation unit 102a includes a first transfer function 701 (K1). The reactive power calculation unit 102b includes a second transfer function 702 (K2). The active power correction unit 102c includes a third transfer function 703 (C1). The reactive power correction unit 102d includes a fourth transfer function 704 (C2).

  The measurement value acquisition unit 101 acquires the measurement value F of the frequency (first physical quantity) and the measurement value V of the voltage (second physical quantity) in the power system 400 measured by the measuring instrument 450.

  Specifically, the measurement value acquisition unit 101 includes a first measurement value acquisition unit 101a and a second measurement value acquisition unit 101b, and the first measurement value acquisition unit 101a has a frequency (first physical quantity) in the power system 400. The second measured value acquisition unit 101b acquires the measured value V of the voltage (second physical quantity) in the power system 400.

  Then, the first difference calculation unit 107 a calculates a difference ΔF between the frequency measurement value F and the target frequency (first target value) 710.

  The second difference calculation unit 107b calculates a difference ΔV between the voltage measurement value V and the target voltage (second target value) 720.

  Then, the active power calculation unit 102a uses the first transfer function 701 (K1) to calculate an active power target value that is a target value of active power that the power storage device 200 should output from the frequency difference ΔF. When the power storage device 200 outputs active power corresponding to the active power target value, the frequency of the power system 400 can be brought close to the first target value 710.

  On the other hand, the reactive power calculation unit 102b uses the second transfer function 702 (K2) to calculate a reactive power target value that is a target value of reactive power that the power storage device 200 should output from the voltage difference ΔV. . When the power storage device 200 outputs active power corresponding to the reactive power target value, the voltage of the power system 400 can be brought close to the second target value 720.

  However, as described above, the frequency of the power system 400 not only varies depending on the active power output from the power storage device 200 but also varies depending on the influence of the power storage device 200 outputting reactive power.

  Similarly, the voltage of the power system 400 fluctuates not only by the reactive power output by the power storage device 200 but also varies by being affected by the power storage device 200 outputting active power.

  Therefore, the control device 100 according to the present embodiment corrects the active power target value calculated by the active power calculation unit 102a with the active power correction value calculated by the active power correction unit 102c separately, and then stores the power storage device. 200 is output as an active power command value Pr.

  Similarly, the control device 100 separately corrects the reactive power target value calculated by the reactive power calculation unit 102b with the reactive power correction value calculated by the reactive power correction unit 102d, The reactive power command value Qr is output.

  As described above, the active power correction unit 102c calculates an active power correction value that is a correction amount for the active power target value calculated by the active power calculation unit 102a. Specifically, the active power correction unit 102c uses the third transfer function 703 to calculate the active power correction value from the reactive power target value calculated by the reactive power calculation unit 102b. In this way, it is possible to cancel out fluctuations in the frequency of the power system 400 caused by the power storage device 200 outputting reactive power.

  Similarly, the reactive power correction unit 102d calculates a reactive power correction value that is a correction amount for the reactive power target value calculated by the reactive power calculation unit 102b. Specifically, the reactive power correction unit 102d calculates a reactive power correction value from the active power target value calculated by the active power calculation unit 102a using the fourth transfer function 704. In this way, it is possible to cancel out fluctuations in the voltage of the electric power system 400 caused by the power storage device 200 outputting active power.

  The first command value calculation unit 102e corrects the active power target value with the active power correction value (added in the present embodiment), and calculates the command value Pr of the active power for the power storage device 200.

  The second command value calculation unit 102f calculates the reactive power command value Qr for the power storage device 200 by correcting (adding in this embodiment) the reactive power target value with the reactive power correction value.

  The command value output unit 106 shown in FIG. 3 outputs the command value Pr for active power and the command value Qr for reactive power calculated in this way to the power storage device 200.

  The control device 100 according to the present embodiment uses the active power correction unit 102c and the reactive power correction unit 102d determined as described above to use the active power command value Pr and the reactive power command that the power storage device 200 should output. The value Qr is calculated. For this reason, when the power storage device 200 outputs the active power Pb and the reactive power Qb, it is possible to remove interference generated in the frequency, power flow, and voltage of the power system 400, and the frequency, power flow, voltage, etc. of the power system 400 can be removed. This makes it possible to control a plurality of types of physical quantities more accurately.

  The measurement value acquisition unit 101 acquires the frequency measurement value F and the voltage measurement value V every predetermined period (for example, every hour). However, the control device 100 according to the present embodiment uses the measurement value Each time the acquisition unit 101 acquires these measurement values, the active power command value Pr and the reactive power command value Qr are newly calculated and output to the power storage device 200.

  According to such an aspect, it is possible to continuously output the optimum active power command value Pr and reactive power command value Qr to the power storage device 200 according to the latest state of the power in the power system 400. become.

  Of course, the timing at which the control device 100 calculates the active power command value Pr and the reactive power command value Qr may not be the same as the timing at which the frequency measurement value F and the voltage measurement value V are acquired.

  Next, a control method of the control device 100 according to the present embodiment will be described with reference to the flowchart of FIG.

  First, the measured value acquisition unit 101 acquires the measured value F of the frequency (first physical quantity) and the measured value V of the voltage (second physical quantity) in the power system 400 measured by the measuring instrument 450 (S1000).

  Then, the active power calculation unit 102a uses the first transfer function 701 (K1) to calculate the effective power to be output from the power storage device 200 from the difference ΔF between the frequency measurement value F and the target frequency (first target value) 710. An active power target value that is a power target value is calculated. Similarly, the reactive power calculation unit 102b uses the second transfer function 702 (K2) to output the power storage device 200 from the difference ΔV between the voltage measurement value V and the target voltage (second target value) 720. A reactive power target value that is a target value of the reactive power to be calculated is calculated (S1010).

  Then, the active power correction unit 102c uses the third transfer function 703 to calculate an active power correction value from the reactive power target value calculated by the reactive power calculation unit 102b. Similarly, the reactive power correction unit 102d uses the fourth transfer function 704 to calculate a reactive power correction value from the active power target value calculated by the active power calculation unit 102a (S1020).

  Then, the first command value calculation unit 102e corrects the active power target value with the active power correction value (addition in the present embodiment), and calculates the active power command value Pr for the power storage device 200. Similarly, the second command value calculation unit 102f corrects the reactive power target value with the reactive power correction value (added in the present embodiment), and calculates the reactive power command value Qr for the power storage device 200 (S1030). .

  Then, the command value output unit 106 outputs the command value Pr for active power and the command value Qr for reactive power to the power storage device 200 (S1040).

  By controlling the control device 100 in such a manner, it is possible to remove interference generated in the frequency, power flow, and voltage of the power system 400 when the power storage device 200 outputs the active power Pb and the reactive power Qb. It is possible to more accurately control a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system 400.

<Update function of transfer function>
Next, the transfer function update function and operation of the control device 100 according to the present embodiment will be described with reference to FIGS. 3, 6, and 8.

  As illustrated in FIG. 3, the control device 100 includes a measurement value acquisition unit 101 and a function update unit (first function update unit 104a, second function update unit 104b, third function update unit 104c, and fourth function update unit 104d. ) 104.

  As described above, the measurement value acquisition unit 101 uses the measurement value F of the frequency (first physical quantity) in the power system 400 measured by the measuring instrument 450 every predetermined time (for example, every hour) and the voltage (second). Measurement value V of (physical quantity) is acquired.

  The command value output unit 106 also outputs a command value Pr for active power and a command value Qr for reactive power to the power storage device 200 at predetermined time intervals (for example, every hour).

  At this time, the first function updating unit 104a, for example, by using a known system identification technique, the history of the command value Pr of active power and the command value Qr of reactive power within a predetermined period (for example, the past month), The control parameters of the fifth transfer function 705 (G11) and the sixth transfer function 706 (G12) are updated using the history of the measurement value F of the frequency within the same predetermined period (for example, the past month).

  For example, the first function updating unit 104a uses the frequency measurement value F as an objective variable, the active power command value Pr and the reactive power command value Qr as explanatory variables, and uses the fifth transfer function 705 (G11) and the sixth transfer function. The control parameters of the fifth transfer function 705 (G11) and the sixth transfer function 706 (G12) are updated by performing regression analysis using the sum of 706 (G12) as a regression equation.

  Then, the second function updating unit 104b substitutes the updated fifth transfer function 705 (G11) and sixth transfer function 706 (G12) into (Equation 11), thereby obtaining the third transfer function 703 (C1). Update.

  Similarly, the third function updating unit 104c uses the system identification technique to record the active power command value Pr and the reactive power command value Qr within a predetermined period (for example, the past one month) and the same specified period. The control parameters of the seventh transfer function 707 (G22) and the eighth transfer function 708 (G21) are updated using the history of the measured value V of the voltage (for example, for the past month).

  Then, the fourth function updating unit 104d substitutes the updated seventh transfer function 707 (G22) and eighth transfer function 708 (G21) into (Equation 12), thereby obtaining the fourth transfer function 704 (C2). Update.

  In this way, the control device 100 according to the present embodiment has a correction value that cancels interference generated in the frequency, power flow, and voltage of the power system 400 when the power storage device 200 outputs the active power Pb and the reactive power Qb. The third transfer function 703 (C1) and the fourth transfer function 704 (C2) for calculation are updated. With such an aspect, the control device 100 according to the present embodiment can more accurately control a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system 400.

  In addition, the control device 100 performs the third transfer function 703 (C1) and the fourth transfer at regular intervals, such as every week, every month, every year, or at irregular times designated by the operator. The function 704 (C2) may be updated. According to such an aspect, even when the electrical characteristics (G11 to G22) of the power system 400 change with time, it is possible to continue the control for a plurality of types of physical quantities of the power system 400 with high accuracy.

  Further, even when the third transfer function 703 (C1) and the fourth transfer function 704 (C2) for removing the interference generated in the frequency, power flow, and voltage of the power system 400 cannot be designed in advance, the power storage It is also possible to perform a flexible operation such as removing the interference after the operation of the apparatus 200 is started.

  Next, a control method of the control device 100 according to the present embodiment will be described with reference to the flowchart of FIG.

  First, the measurement value acquisition unit 101 acquires a frequency measurement value F and a voltage measurement value V in the power system 400 measured by the measuring instrument 450 (S2000).

  The function updating unit 104 uses the active power command value Pr and reactive power command value Qr within a predetermined period, and the frequency measurement value F and voltage measurement value V within the same predetermined period, for example, The fifth transfer function 705 (G11) to the eighth transfer function 708 (G21) are updated by the system identification technique (S2010).

  Then, the function updating unit 104 updates the third transfer function 703 (C1) and the fourth transfer function 704 (C2) according to (Expression 11) and (Expression 12) (S2020).

  By controlling the control device 100 in this way, even when the electrical characteristics (G11 to G22) of the power system 400 change with time, control over a plurality of types of physical quantities of the power system 400 is continued with high accuracy. It becomes possible.

== Other Embodiments ==
The control device 100 may calculate a command value for active power and a command value for reactive power output to the power storage device 200 according to the block diagram shown in FIG.

  In the block diagram shown in FIG. 9, a ninth transfer function 740 (D1) and a tenth transfer function 741 (D2) are added to the block diagram shown in FIG.

  The ninth transfer function 740 (D1) functions as a fluctuation corresponding controller corresponding to the active power. In addition, the tenth transfer function 741 (D2) functions as a fluctuation corresponding controller corresponding to reactive power.

  Similarly to the first transfer function 701 (K1) and the second transfer function 702 (K2), the ninth transfer function 740 (D1) and the tenth transfer function 741 (D2) are stored in the storage device 140, for example. Designed using information 730.

  In this case, the active power target value, which is the target value of the active power to be output by the power storage device 200, is calculated by calculating the frequency difference ΔF using the first transfer function 701 (K1) and the ninth transfer function 740 (D1). It is calculated by doing. The reactive power target value is calculated by calculating the voltage difference ΔV using the second transfer function 702 (K2) and the tenth transfer function 741 (D2).

  Then, the first command value calculation unit 102e corrects (adds in this embodiment) the active power target value with the active power correction value calculated by the third transfer function 703 (C1), and outputs the target value to the power storage device 200. A command value Pr for active power is calculated.

  The second command value calculation unit 102f corrects (adds in this embodiment) the reactive power target value with the reactive power correction value calculated by the fourth transfer function 704 (C2), and reacts the reactive power with respect to the power storage device 200. Command value Qr is calculated.

  Next, the third transfer function 703 (C1) and the fourth transfer function 704 (C2) when the block diagram shown in FIG. 9 is used will be specifically described.

  First, from the block diagram shown in FIG. 9, the following (Expression 13) to (Expression 18) hold.

Pr = (D1 × K1 × ΔF) + (C1 × K2 × ΔV) (Formula 13)
Qr = (C2 × K1 × ΔF) + (D2 × K2 × ΔV) (Formula 14)
F ′ = (G11 × Pb) + (G12 × Qb) (Formula 15)
V ′ = (G21 × Pb) + (G22 × Qb) (Formula 16)
Pb = Pr (Formula 17)
Qb = Qr (Formula 18)
When Pr, Pb, Qr, and Qb are deleted from (Expression 13) to (Expression 18), (Expression 19) to (Expression 20) are obtained.

F ′ = (G11 × D1 + G12 × C2) × (K1 × ΔF) + (G11 × C1 + G12 × D2) × (K2 × ΔV) (Equation 19)
V ′ = (G21 × D1 + G22 × C2) × (K1 × ΔF) + (G21 × C1 + G22 × D2) × (K2 × ΔV) (Equation 20)
In order to eliminate interference, (Expression 21) to (Expression 22) must be satisfied. Then, by solving (Equation 21) to (Equation 22) for C1 and C2, C1 and C2 can be obtained as (Equation 23) to (Equation 24).

(G11 × C1 + G12 × D2) = 0 (Formula 21)
(G21 × D1 + G22 × C2) = 0… (Formula 22)
C1 =-(G12 × D2) / G11 (Equation 23)
C2 =-(G21 × D1) / G22 (Formula 24)
That is, the third transfer function 703 (C1) and the fourth transfer function 704 (C2) are the fifth transfer function 705 (G11) to the eighth transfer function 708 (G21), which are transfer functions of the power system 400, and the ninth transfer function. This can be determined by obtaining the function 740 (D1) and the tenth transfer function 741 (D2).

  Also in the present embodiment, the fifth transfer function 705 (G11) to the eighth transfer function 708 (G21) can be obtained by using a known system identification technique as described above.

  Therefore, also in the case of the control device 100 according to the present embodiment, the power storage device 200 is configured by incorporating the third transfer function 703 (C1) and the fourth transfer function 704 (C2) thus determined in the control model. The command value Pr for the active power to be output and the command value Qr for the reactive power can be calculated. Then, when the power storage device 200 outputs the active power Pb and the reactive power Qb, it is possible to remove interference generated in the frequency, current, and voltage of the power system 400. It becomes possible to control the physical quantity of the type more accurately.

  As described above, according to the control device 100, the control method of the control device 100, and the control program 600 according to the present embodiment, interference generated in a plurality of types of physical quantities such as the frequency, power flow, and voltage of the power system 400 is removed. It becomes possible to control the electric power system 400 more accurately.

  In addition, it is possible to improve and maintain the quality of power in the power system 400 and reduce labor for that purpose.

  The embodiments described above are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

DESCRIPTION OF SYMBOLS 100 Control apparatus 101 Measurement value acquisition part 102 Operation part 103 Storage part 104 Function update part 105 Predicted value calculation part 106 Command value output part 107 Difference calculation part 110 CPU
120 Memory 130 Communication Device 140 Storage Device 150 Input Device 160 Output Device 170 Recording Medium Reading Device 200 Power Storage Device 210 Bidirectional Converter 220 Energy Storage Unit 300 Transformer 400 Electric Power System 410 Power Generation Equipment 420 Bus 430 Transmission / Distribution Electric Wire 440 Load 450 Measurement 600 Control program 700 to 709 Transfer function 710 First target value 720 Second target value 730 System information 740 to 741 Transfer function 800 Recording medium

Claims (8)

A control device for controlling a power storage device linked to a power system,
The active power target value to be output by the power storage device to control the first physical quantity in the power system to a first target value, and the power storage to control the second physical quantity in the power system to a second target value. A power calculation unit for calculating a target value of reactive power to be output by the device;
The correction value of the active power that cancels the fluctuation of the first physical quantity that is generated when the power storage device outputs the reactive power, and the second physical quantity that is generated when the power storage device outputs the active power. A power correction unit that calculates a correction value of the reactive power so as to cancel the fluctuation of
A command value of active power calculated by correcting the target value of active power with the correction value of active power, and a command value of reactive power calculated by correcting the target value of reactive power with the correction value of reactive power A command value output unit for outputting to the power storage device,
A control device comprising: The control device according to claim 1,
The power calculation unit calculates a target value of the active power using a first function capable of calculating a target value of the active power from a difference between the first physical quantity and the first target value, and the second physical quantity And calculating the reactive power target value using a second function capable of calculating the reactive power target value from the difference between the second target value and the second target value,
The power correction unit calculates the correction amount of the active power using a third function capable of calculating the correction amount of the active power from the target value of the reactive power, and calculates the reactive power of the reactive power from the target value of the active power. A control device that calculates a correction amount of the reactive power using a fourth function that can calculate a correction amount. The control device according to claim 2,
The third function is a fifth function capable of calculating a calculated value of the first physical quantity that is expected when the power storage device outputs active power corresponding to the command value of the active power from the command value of the active power. A sixth function capable of calculating from the command value of the reactive power, a function, and a fluctuation amount of the first physical quantity that is expected when the power storage device outputs the reactive power according to the reactive power command value; A control apparatus characterized by being defined using The control device according to claim 3,
A first measurement value acquisition unit for acquiring a measurement value of the first physical quantity measured by a measuring instrument installed in the power system;
A history of the command value of the active power and the command value of the reactive power output to the power storage device by the command value output unit within a predetermined period in the past, and a history of the measurement value of the first physical quantity in the predetermined period; And a first function updating unit that updates the fifth function and the sixth function,
A second function updating unit that updates the third function using the updated fifth function and the sixth function;
A control device comprising: The control device according to any one of claims 2 to 4,
The fourth function is a seventh function that can calculate a calculated value of the second physical quantity expected from the reactive power command value output from the reactive power command value from the reactive power command value. An eighth function capable of calculating from the command value of the active power, a function, and a fluctuation amount of the second physical quantity that is expected when the power storage device outputs the active power according to the command value of the active power; A control apparatus characterized by being defined using The control device according to claim 5,
A second measurement value acquisition unit for acquiring a measurement value of the second physical quantity measured by a measuring instrument installed in the power system;
A history of the command value of the active power and the command value of the reactive power output by the command value output unit to the power storage device within a predetermined period in the past, and a history of the measurement value of the second physical quantity in the predetermined period, And a third function updating unit for updating the seventh function and the eighth function,
A fourth function updating unit that updates the fourth function using the updated seventh function and the eighth function;
A control device comprising: A control method of a control device of a power storage device linked to a power system,
The control device controls the target value of the active power to be output by the power storage device to control the first physical quantity in the power system to the first target value, and the second physical quantity in the power system to the second target value. To calculate the reactive power target value to be output by the power storage device,
When the control device cancels the fluctuation of the first physical quantity caused by the power storage device outputting the reactive power, the active power correction value, and the power storage device outputs the active power. Calculating a correction value of the reactive power so as to cancel the fluctuation of the second physical quantity that occurs,
The control device calculates the active power command value calculated by correcting the active power target value using the active power correction value and the reactive power target value corrected using the reactive power correction value. A reactive power command value is output to the power storage device. In the control device that controls the power storage device linked to the power system,
The active power target value to be output by the power storage device to control the first physical quantity in the power system to a first target value, and the power storage to control the second physical quantity in the power system to a second target value. A function for calculating a target value of reactive power to be output by the device;
The correction value of the active power that cancels the fluctuation of the first physical quantity that is generated when the power storage device outputs the reactive power, and the second physical quantity that is generated when the power storage device outputs the active power. A function of calculating a correction value of the reactive power so as to cancel the fluctuation of
A command value of active power calculated by correcting the target value of active power with the correction value of active power, and a command value of reactive power calculated by correcting the target value of reactive power with the correction value of reactive power And a function of outputting to the power storage device,
Program to realize.

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